<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片区 -->
    <el-card>
      <!-- 头部警告区 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon :closable="false"></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            expand-trigger="hover"
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            size="mini"
            type="primary"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!--输入添加文本框  -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-add"
                  @click="showeditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            size="mini"
            type="primary"
            :disabled="isBtnDisabled"
            @click="addDialogVisible=true"
          >添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!--输入添加文本框  -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-add"
                  @click="showeditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  type="danger"
                  size="mini"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加'+ titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改对话框 -->
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'修改'+ titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择框双向绑定到的数组
      selectedCateKeys: [],
      //被激活的页签名称
      activeName: "many",
      //动态参数的数据
      manyTableData: [],
      //静态属性的数据
      onlyTableData: [],
      //控制添加对话框的显示与隐藏
      addDialogVisible: false,
      //添加参数的表单数据
      addForm: {},
      //添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },

      //控制修改对话框的显示与隐藏
      editDialogVisible: false,
      //修改的表单数据对象
      editForm: {},
      //修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      // //控制按钮与文本框的切换显示
      // inputVisible:false,
      // //文本框中输入的内容
      // inputValue:'',
    }
  },
  //生命周期函数
  created() {
    //获取所有的商品分类
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories")
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败")
      }

      this.cateList = res.data
      console.log(res.data)
    },
    //级联选择框选中项变化变回触发
    handleChange() {
      this.getParamsData()
    },
    //tab页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData()
      console.log(this.activeName)
    },
    //获取参数的列表数据
    async getParamsData() {
      //证明选中不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData=[]
        this.onlyTableData=[]
        return this.$message.info("您选的不是三级分类")
      }
      //证明选中的是三级分类
      console.log(this.selectedCateKeys)
      //根据所选分类的 id和当前所处的面版获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateID}/attributes`,
        {
          params: { sel: this.activeName },
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表失败")
      }
      //   分割参数
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : []
        //控制文本框的显示与隐藏
        item.inputVisible=false
        //文本框中输入的值
        item.inputValue=''
      })
      console.log(res.data)
      if (this.activeName === "many") {
        //获取的动态参数
        this.manyTableData = res.data
      } else {
        //获取的是静态属性
        this.onlyTableData = res.data
      }
    },
    //监听对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error("添加失败")
        }
        const { data: res } = await this.$http.post(
          `categories/${this.cateID}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败")
        }
        this.$message.success("添加参数成功")
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    //点击编辑按钮展示修改对话框
    async showeditDialog(attr_id) {
      this.editDialogVisible = true
      //查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateID}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数信息失败")
      }
      this.editForm = res.data
    },
    //重置修改表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    //点击按钮修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error("数据有误")
        }
        const { data: res } = await this.$http.put(
          `categories/${this.cateID}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败")
        }
        this.$message.success("修改参数成功")
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    //根据id删除对应的参数项
    async removeParams(attr_id) {
      const resultConfirm = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err)
      if (resultConfirm !== "confirm") {
        return this.$message.info("取消了删除")
      }
      const { data: res } = await this.$http.delete(
        `categories/${this.cateID}/attributes/${attr_id}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败")
      }
      this.$message.success("删除成功")
      this.editDialogVisible = false
      this.getParamsData()
    },
    //文本框失去交点或者按下了enter建都会触发
   async  handleInputConfirm(row){
      //trim  去除字符串两端的空格
      if(row.inputValue.trim().length===0){
        row.inputValue=''
      row.inputVisible=false
      return 
      }
      //没有return  则输入了内容
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue=''
      row.inputVisible=false
      //需要发起请求保存这次操作
      this.saveAttrVals(row)

    },
    //将对attr_vals的操作保存到数据库
   async saveAttrVals(row){
          //需要发起请求保存这次操作
   const{data:res}=await   this.$http.put(`categories/${this.cateID}/attributes/${row.attr_id}`,{
        attr_name:row.attr_name,
        attr_sel:row.attr_sel,
        attr_vals:row.attr_vals.join(' ')
      })
      if(res.meta.status!==200){
        return this.$message.error('操作失败')
      }
      this.$message.success('操作成功')
    },
    //点击按钮展示文本输入框
    showInput(row){
row.inputVisible=true
//让文本框自动获得焦点
//$nextTick  方法作用  当页面上元素被重新渲染之后，才能指定回调函数中的代码
 this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
    },
    //删除对应的参数可选项
    handleClose(i,row){
row.attr_vals.splice(i,1)
this.saveAttrVals(row)
    }
  },
  //计算属性
  computed: {
    //如果按钮需要被禁用则返回true,否则false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的id
    cateID() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === "many") {
        return "动态参数"
      }
      return "静态属性"
    },
  },
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin-top: 30px;
}
.el-cascader {
  width: 30%;
}
.el-tabs {
  margin-top: 30px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag{
  width:10%
}
</style>